Orbiting Neptune Asteroid Belt Jupiter Ring System Kuiper Belt
WAC Corporal Explorer 1 Sputnik 1 V2 Missile
Enterprise Columbia Atlantis Discovery
Leda Phobos Deimos Calypso
9 3 7 5
Titan Io Europa Mars
Twin systems Double planets Binary planets Biplanetary systems
Titan Io Callisto Ganymede
149 million km/second 299 million km/second 186 million km/second 93 million km/second
The Hoyle Equation The Hawking Equation The Sagan Equation The Drake Equation